Error message is present but invisible

Summary

When you add a parent to a RecordType, you also have to add the obligatory Properties (manually currently). If you forget to do this in the web interface every thing behaves as if the update went fine, but if you reload the recordtype, you realize that the update was not performed.

Expected Behavior

There should be an error message explaining what is happening

Actual Behavior

No sign of an error

Steps to Reproduce the Problem

1. Create an RT with an obligatory Property
2. Try to create another RT that has the first as parent but do not add obligatory properties
3. Click save